<template>
    <div>
         <!-- 面包屑导航区域 -->
         <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类: </span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="catelist"  expand-trigger="hover" @change="handleChange" :props="cateProps"></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区 -->
            <el-tabs v-model="activeName"@tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag :key="i" v-for="(item,i) in scope.row.attr_vals" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column lable="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column lable="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                     <!-- 静态参数表格 -->
                     <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag :key="i" v-for="(item,i) in scope.row.attr_vals" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column lable="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column lable="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                  <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                  <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框 双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类列表失败')
            }
            this.catelist = res.data
        },
        // 级联选择框选中项变化 会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick() {
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
             // 证明选中的不是三级分类
             if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 如果能继续执行证明选中的是三级分类
            // 根据所选分类的id和当前所处的面板 获取对应的参数
            const{data:res} = await this.$http.get(`categories/${this.catId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数失败')
            }
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })
            if(this.activeName === 'many') {
                this.manyTableData = res.data
            }else {
                this.onlyTableData = res.data
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮 添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.catId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                // 关闭添加的对话框
                this.addDialogVisible = false 
                // 重新获取参数列表数据
                this.getParamsData()
            })
        },
        // 点击按钮 展示修改的对话框
        async showEditDialog(attr_id) {
            // 查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.catId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status !== 200) {
                return this.$message.error('查询参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改参数信息 
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.catId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.editDialogVisible = false
                this.getParamsData()
            })
        },
        // 根据ID删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if(confirmResult != 'confirm'){
            return this.$message.info('已取消删除')
        }
        // 删除的业务逻辑
        const {data:res} = await this.$http.dalete(`categories/${this.catId}/attributes/${attr_id}`)
        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
        },
        // 文本框失去焦点或按下了 Enter(回车键) 都会触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return 则证明输入了内容 需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求 保存这一次操作
            const {data:res} = await this.$http.put(`categories/${this.catId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数失败')
            }

            this.$message.success('修改参数成功')

            
        },
        // 将对attr_vals的操作保存到数据库
        async savaAttrVals(row) {
             // 需要发起请求 保存这一次操作
             this.savaAttrVals(row)
        },
        // 点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用 就是当页面上元素被重新渲染之后才会执行回调函数中的代码
            this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 删除对应的参数可选项
        handleClose(i,row) {
            row.attr_vals.splice(i,1)
            this.savaAttrVals(row)
        }
    },
    // 定义一个计算属性
    computed:{
        // 如果按钮需要被禁用 则返回 true 否则返回 false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的 三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }

}

</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>